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Related Concept Videos

The Colloidal State01:29

The Colloidal State

The formation of a colloidal system is exemplified by an aqueous solution containing Cl− ions is introduced to another containing Ag+ ions, resulting in the precipitation of solid AgCl as extremely tiny crystals. Instead of settling out as a filterable precipitate, these crystals remain suspended in the liquid, showcasing a colloidal system.A colloidal system involves colloidal particles within the approximate range of 1 to 1000 nm in at least one dimension, dispersed in a medium called the...
Colloids03:22

Colloids

Children at play often make suspensions such as mixtures of mud and water, flour and water, or a suspension of solid pigments in water known as tempera paint. These suspensions are heterogeneous mixtures composed of relatively large particles that are visible to the naked eye or can be seen with a magnifying glass. They are cloudy, and the suspended particles settle out after mixing. On the other hand, a solution is a homogeneous mixture in which no settling occurs and in which the dissolved...
Colloids and Suspensions01:17

Colloids and Suspensions

Children at play often make suspensions such as mixtures of mud and water, flour and water, or a suspension of solid pigments in water known as tempera paint. These suspensions are heterogeneous mixtures composed of relatively large particles visible to the naked eye or seen with a magnifying glass. They are cloudy, and the suspended particles settle out after mixing. The suspended particles in a suspension settle out after some time of mixing. The separation of particles from a suspension is...
Colloidal precipitates01:09

Colloidal precipitates

The high insolubility of some precipitates can result in an unfavorable relative supersaturation. This can lead to colloidal particles with a large surface-to-mass ratio, where adsorption is promoted. For instance, in the precipitation of silver chloride, silver ions are adsorbed on the surface of the colloidal particles, forming a primary layer. This layer attracts ions of opposite charge (such as nitrate ions), forming a diffuse secondary layer of adsorbed ions. This electric double layer...
Coagulation01:06

Coagulation

Colloidal solids are solid particles suspended in solution. They are usually negatively charged, attracting a compact primary layer of positively charged ions, which attract more counterions to form an electrical double layer. Electrostatic repulsion between the charged double layers prevents the particles from colliding, stabilizing the colloids. These solids are often undesirable because they can contain toxins that are difficult to remove. Coagulation is a technique that helps aggregate and...
Precipitate Formation and Particle Size Control01:16

Precipitate Formation and Particle Size Control

In precipitation gravimetry, the precipitating agent should react specifically or selectively with the analyte. While a specific reagent reacts with the analyte alone, a selective reagent can react with a limited number of chemical species.
The obtained precipitate should be either a pure substance of known composition or easily converted to one by a simple process, such as ignition or drying. In addition, the precipitate should be insoluble and easily filterable. In general, filterability...

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Confocal Imaging of Confined Quiescent and Flowing Colloid-polymer Mixtures
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Published on: May 20, 2014

Interactions between spheroidal colloidal particles.

P Schiller1, S Krüger, M Wahab

  • 1Department of Physical Chemistry, TU Bergakademie Freiberg, Leipziger Strasse 29, 09599 Freiberg, Germany.

Langmuir : the ACS Journal of Surfaces and Colloids
|July 26, 2011
PubMed
Summary
This summary is machine-generated.

We calculated interaction energies for colloidal spheroids, finding that attractive forces promote parallel alignment. This alignment leads to stable, densely packed configurations with consistent lattice energy, crucial for photonic crystals.

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Synthesis and Characterization of Supramolecular Colloids
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Area of Science:

  • Colloid science
  • Materials science
  • Condensed matter physics

Background:

  • Colloidal systems exhibit complex interactions influencing their self-assembly.
  • Understanding inter-particle forces is key to designing functional materials like photonic crystals.

Purpose of the Study:

  • To evaluate interaction energies between colloidal spheroids considering multiple forces.
  • To investigate the relationship between inter-particle forces, alignment, and packing configurations.
  • To assess the stability implications for spheroid-based photonic crystals.

Main Methods:

  • Application of Derjaguin's approximation to calculate interaction energies.
  • Derivation of simple pair potentials for short interaction ranges.
  • Analysis of attractive forces and their effect on spheroid alignment.
  • Examination of densely packed configurations and their lattice energies.

Main Results:

  • Attractive interactions (van der Waals, electrostatic, depletion, capillary) favor parallel alignment of spheroids.
  • Simple pair potentials are derivable when interaction range is smaller than particle axes.
  • Various densely packed configurations of parallel spheroids exhibit identical lattice energy.
  • Degeneracy in lattice energy impacts the stability of photonic crystals.

Conclusions:

  • Attractive forces dictate parallel alignment in colloidal spheroids.
  • The observed lattice energy degeneracy has significant implications for the stability of photonic crystals.
  • This work provides insights into the self-assembly and structural properties of anisotropic colloidal systems.